mat

s@ui

uc.e

duYour life with CLEO + BTEV

Your life with CLEO + BTEV

The bottom line: We are a small, friendly, well supported

group of particle physicists.

We work on a variety of interesting physicstopics.

We contribute significantly to the design & construction of detectors and electronics.

I am looking for (~2) enthusiastic students that like to roll up their sleeves & dive into some fascinating work.

GSAC: Mats Selen, February 24, 2001

mat

s@ui

uc.e

du

CLEOCLEO

mat

s@ui

uc.e

du

DS* and DS Fragmentation and PVDS* and DS Fragmentation and PV

Try to understand charm production Momentum distributions Spin states

c

c

Hadronization(QCD)

D, DS, D*...

e+ e

Johnson, Selen

(graduated July/00)

mat

s@ui

uc.e

du

DS* and DS Fragmentation and PVDS* and DS Fragmentation and PV

Ds Yields as a function of x(Ds)

.44<x<.50 .50<x<.56

.56<x<.62 .62<x<.68

.68<x<.74 .74<x<.80

.80<x<.86 .86<x<.92

.92<x<.98 .92<x<1

mat

s@ui

uc.e

du

DS* and DS Fragmentation and PVDS* and DS Fragmentation and PV

Comparison with Andersson model using parameters found by previous measurement

mat

s@ui

uc.e

du

DS* and DS Fragmentation and PVDS* and DS Fragmentation and PV

PV = 0.45 0.05

Other

experiments:

Just counting spins we would expect

PV = V / (V + P) = 3/4

+ -

V (J=1) P (J=0)

mat

s@ui

uc.e

du

D0 K+0 Resonant SubstructureD0 K+0 Resonant Substructure

Try to understand charm decay Resonant substructure QM Interference

c Hadronization(QCD)

D0

K

Bergfeld, Selen

(graduated May/00)

mat

s@ui

uc.e

du

Locations of resonances in the Dalitz Plot and projections

+ K*0 K*- Non-Resonant

D0 K+0D0 K+0

mat

s@ui

uc.e

du

Final Best Fit with Seven Resonances

+ K*0 K* Non-ResonantK0(1430) K0(1430)0 K*(1680) ’+

D0 K+0D0 K+0

M(K(GeV2)

M(

(GeV

2 )

mat

s@ui

uc.e

du

D0 mixing using D0KeD0 mixing using D0Ke

D0

K

e

D*+

D0

mixmixed

D0

K

e

D*+

Un-mixed

Sedlack, Selen

Using “neural net” techniques

mat

s@ui

uc.e

du

B0 D*l and VcbB0 D*l and Vcb

Last CLEO result: PRD 51, 1014 (1995)

bB c

l

D*

q2max

Plager, Selen

This is where the money is (q2max) !

mat

s@ui

uc.e

du

mat

s@ui

uc.e

du

BTeVBTeV

B meson decays can tell us a lot about the Standard Model (and beyond), but we need more data.

For the next 5 years, B physics will be dominated by BaBar (SLAC), Belle (KEK) and CDF/D0 (FNAL).

BTEV is a new experiment (ready in 5 years) that will dominate B physics in the LHC era.

BTEV will collect more useable B data in a few days than the e+e- “B Factories” do in a year.

Motivation:

tbtstd

cbcscd

ubusud

VVV

VVV

VVV

CKMV

mat

s@ui

uc.e

du

BTeVBTeV

Present knowledge:

: Angles

Sides :

mat

s@ui

uc.e

du

BTeVBTeV

Why forward?

Boost

B-B Correlation

2.5

5.0

7.5

-2.50

-5 =0 2.5 5

10

-10-1 =90o 10 1

Central BTEV BTEV

Boost:

Key fortriggering

Key for large dataset!

mat

s@ui

uc.e

du

If you work with me you will:

Do a physics analysis (of your choice) using CLEO data. (i.e. no waiting).

Work on BTEV trigger & Data Acquisition electronics.

Provide a significant contribution to both experiments (many people will know about you & your work).

You will be able to market yourself in both academics and industry.

Your life with CLEO + BTEV

Your life with CLEO + BTEV